This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.
This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 13 products from haxx, from fedoraproject, from netapp and 10 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2023, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2023-10-18T04:15:11.077
2025-02-13T17:16:47.823
Modified
CVSSv3.1: 9.8 (CRITICAL)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | haxx | libcurl | < 8.4.0 | Yes |
| Operating System | fedoraproject | fedora | 37 | Yes |
| Application | netapp | active_iq_unified_manager | - | Yes |
| Application | netapp | active_iq_unified_manager | - | Yes |
| Application | netapp | oncommand_insight | - | Yes |
| Application | netapp | oncommand_workflow_automation | - | Yes |
| Operating System | microsoft | windows_10_1809 | < 10.0.17763.5122 | Yes |
| Operating System | microsoft | windows_10_21h2 | < 10.0.19044.3693 | Yes |
| Operating System | microsoft | windows_10_22h2 | < 10.0.19045.3693 | Yes |
| Operating System | microsoft | windows_11_21h2 | < 10.0.22000.2600 | Yes |
| Operating System | microsoft | windows_11_22h2 | < 10.0.22621.2715 | Yes |
| Operating System | microsoft | windows_11_23h2 | < 10.0.22631.2715 | Yes |
| Operating System | microsoft | windows_server_2019 | < 10.0.17763.5122 | Yes |
| Operating System | microsoft | windows_server_2022 | < 10.0.20348.2113 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For haxx's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.